Numerical modelling of lawsonite thin film as radiative cooling minerals for dew harvesting

Harvesting dew can be used as a renewable complementary source of water both for drinking and agriculture in specific arid or semi-arid water-stressed areas. Condensation of water vapor by nighttime radiative cooling is the phenomenon that can be explained the dew formation on plants or surfaces. In this paper, we propose the lawsonite mineral, as a potential radiative cooling material, for exploiting this natural phenomenon. Furthermore, a computer model that includes meteorological parameters, obtained from the coastal region of Southern Morrocco (Mirleft-South of Agadir), is used to determine the thermal balance and fit to dew mass evolution. In order to form global estimates of dew formation potential via our dew formation model, we combined different meteorological data with radiative properties of natural lawsonite condenser (CaAl2Si2O7(OH)2·H2O) to enhance the modelled dew yield. The daily modelled yields show that significant amounts of dew water can be calculated as a function of the condenser temperature, the thickness condenser as well as the wind speed. Keywords: Condensation, Radiative cooling, Lawsonite, Harvesting dew, Dew yiel

Electron impact ionization of krypton ions (/b q/=8-13)

Absolute cross sections for electron impact single ionization of Kr/sup 10+/ and Kr/sup 11+/ ions and double ionization of Kr /sup q+/ (/b q/=8-13) have been measured in an animated crossed-electron ion beam experiment. Ionization thresholds corresponding to particular electron pairs and inner-shell electron ejection are estimated from a structure Hartree-Fock calculation. For double ionization, results show that, along the homonuclear sequence, direct double ionization is progressively overcome due to the increasing relative importance of direct /b L/-shell ionization followed by autoionization. The presence of ions in metastable states is observed for Kr/sup 8+/ and Kr/sup 9+/ contributing to direct and indirect processes.Anglai